First commit towards replacing pCon-> with someFunc(pCon)

This is accompanied with the removal of dead code in conman.c and else

macro.c

@@ -171,7 +171,7 @@ static int SicsUnknownProc(ClientData pData, Tcl_Interp * pInter,
   }
 
   /* invoke */
-  pCon->sicsError = 0;
+  SCSetSicsError(pCon,0);
   iMacro = SCinMacro(pCon);
   SCsetMacro(pCon, 1);
   old = StatisticsBegin(pCommand->stat);
@@ -202,7 +202,7 @@ static int SicsUnknownProc(ClientData pData, Tcl_Interp * pInter,
     return TCL_OK;
   } else {
     Tcl_SetVar(pInter, SICSERROR, "yes", TCL_GLOBAL_ONLY);
-    pCon->sicsError = 1;
+    SCSetSicsError(pCon,1);
     return TCL_ERROR;
   }
 }